rgb2hex.py

def rgb_hex():
  invalid_msg = "Invalid value, enter a value between (0 - 255)"

  red = int(raw_input("Enter red (R) value:"))
  if red not in range(0,256):
    print invalid_msg

  green = int(raw_input("Enter green (G) value:"))
  if green not in range(0,256):
    print invalid_msg

  blue = int(raw_input("Enter blue (B) value:"))
  if blue not in range(0,256):
    print invalid_msg

  val = (red << 16) + (green << 8) + blue

  print "%s" % (hex(val)[2:]).upper()

def hex_rgb():
  hex_val = raw_input("Enter a hexadecimal value:")

  if len(hex_val) != 6:
    print "Invalid value entered, value should contain 6 digits"
    return

  else:
    hex_val = int(hex_val, 16)

  two_hex_digits = 2 ** 8
  blue = hex_val % two_hex_digits

  hex_val = hex_val >> 8

  green = hex_val % two_hex_digits

  hex_val = hex_val >> 8

  red = hex_val % two_hex_digits

  print "Red: %s Green: %s Blue: %s" % (red, green, blue)


def convert():
  while True:
    option = raw_input("Enter 1 to convert RGB to HEX. Enter 2 to convert HEX to RGB. Enter X to Exit:")

    if option == "1":
    	print "RGB to Hex.."
    	rgb_hex()

    elif option == "2":
    	print "Hex to RGB.."
    	hex_rgb()

    elif option == "X" or option == "x":
      break

    else:
      print "Error"

convert()